Maddie Ziegler Sweetly Describes What Sia Looks Like When the Wig Is Off

Maddie Ziegler -- who will soon be touring with Sia -- gushed about the "Cheap Thrills" singer while chatting with The Insider's Keltie Knight at the Industry Dance Awards on Thursday night. "She's the best. I'm so honored to be dancing with her for six weeks," the 13-year-old performer bragged. "Sia's like my second mom. She's like a best friend to me."

Sia has made it a point to not show her face while onstage, citing that it helps with her stage fright. Ziegler said she's often asked what the 40-year-old musician looks like when the wig is off. "A beautiful, loving, caring face," she described. "People are like, 'I don't know what she looks like,' but if you just go on the internet, she's showed her face before."

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Ziegler added, "People are always like, 'Is she pretty? Is she ugly?' I'm like, 'She's gorgeous and it's not just on the outside, but on the inside too.'"

The former Dance Moms star echoed similar sentiments about Sia when she spoke to ET. "She's literally the sweetest person ever," she exclaimed. "I feel like I'm just so comfortable with her every time I'm with her. I never feel like, 'Oh my god, I'm hanging out with a celebrity.'"

In June, concertgoers at Red Rocks Amphitheatre in Morrison, Colorado, got a rare glimpse at Sia's face when a gust of wind briefly disrupted her famous onstage anonymity. Check it out: